The building had been vacant for several years, according to a man who lives in the area.

"I couldn't identify it but it looked like something backed into the building. I did see a pile of bricks in there. For it to fall on its own, of course that's not unheard of," David Zima of Sheraden said.

The cause of the collapse is not yet known.

The city's building inspector was on scene late Monday morning assessing the damage and says they will have to call in a contractor to clean up the mess.

"I'll have to go back in, see what the building was, see if there is an owner around and hire a contractor to clean this up," said Paul Loy, the demolition manager for Building Inspection.

For now residents are being asked to stay back until crews decide how to clean up the mess and avoid any damage to the hillside.

"I'm very surprised nobody got hurt because usually cars be parked right there . I'm glad cars ain't get totaled or nothing like that," said resident Douglas Winfrey.

The World Anti-Doping Agency (WADA) said Sunday it was "very alarmed" by reports of widespread doping by track and field athletes in major competitions including the Olympic Games and world championships.